The former Southampton ace helped the Young Lions to a 3-0 away win over Iceland in European Championship qualifying and his performance was hailed by a very jubilant Pearce.
"Alex Chamberlain was outstanding," he told FATV.
"He's a real talent and gave us that cutting edge. He's a team-member as well, his general all-round performance was very, very good.
"He's a talented boy who has come on in leaps and bounds since we had him with us at the back end of last season, which is very pleasing.
"Alex is very level-headed, but you have to say that anyone scoring a hat-trick on international duty has done very well and it's very pleasing for any manager."